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    <script>
        // 编写函数map(arr) 把数组中的每一位数字都增加30%，并返回一个新数组
        var arr = [10, 100, 1000];
        var num ;
        var total = "";
        function map(){
            var newarr = [];
            for(i = 0; i < arr.length; i++){
                num = arr[i]* 0.3;
                newarr.push(num);
            }
            return newarr;
        }
        console.log(map());
    </script>
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